PHP encode/decode

Question

I had this code:

eval(str_rot13('shapgvba purpx_sbbgre(){tybony $nz_bcgvba;$y=\'<n uers="uggc://jjj.penmlkugzy.pbz" gnetrg="_oynax">CFQ gb UGZY PFF</n>\';$s=GRZCYNGRCNGU.\'/sbbgre.cuc\';$sq=sbcra($s,\'e\');$p=sernq($sq,svyrfvmr($s));spybfr($sq);vs(fgecbf($p,$y)==0){rpub($nz_bcgvba[\'phfgbz\'][\'cevinpl\']);qvr;}}purpx_sbbgre();'));

I used to decode it with http://www.unphp.net/

Which became this code:

<?php function check_footer() {
    global $am_option;
    $l = '<a href="http://www.crazyxhtml.com" target="_blank">PSD to HTML CSS</a>';
    $f = TEMPLATEPATH . '/footer.php';
    $fd = fopen($f, 'r');
    $c = fread($fd, filesize($f));
    fclose($fd);
    if (strpos($c, $l) == 0) {
        echo ($am_option['custom']['privacy']);
        die;
    }
}
function check_footer() {
    global $am_option;
    $l = '<a href="http://www.crazyxhtml.com" target="_blank">PSD to HTML CSS</a>';
    $f = TEMPLATEPATH . '/footer.php';
    $fd = fopen($f, 'r');
    $c = fread($fd, filesize($f));
    fclose($fd);
    if (strpos($c, $l) == 0) {
        echo ($am_option['custom']['privacy']);
        die;
    }
}
check_footer();

Can someone help me how can I encode this back? I mean I changed somethings but dont know how to encode in similar language/code.

Thank you in advance.

kojiro · Accepted Answer · 2014-07-06 17:32:12Z

2

Rot13 just shifts ascii letters 13 characters. Since there are 26 letters in the ASCII alphabet, this means shifting them 13 characters again will reverse the operation. Since non-ascii-letters will be ignored by the operation altogether, the reverse of rot13 is just rot13 again, as you can see below:

> $x='shapgvba purpx_sbbgre(){tybony $nz_bcgvba;$y=\'<n uers="uggc://jjj.penmlkugzy.pbz" gnetrg="_oynax">CFQ gb UGZY PFF</n>\';$s=GRZCYNGRCNGU.\'/sbbgre.cuc\';$sq=sbcra($s,\'e\');$p=sernq($sq,svyrfvmr($s));spybfr($sq);vs(fgecbf($p,$y)==0){rpub($nz_bcgvba[\'phfgbz\'][\'cevinpl\']);qvr;}}purpx_sbbgre();';
> var_dump($x === str_rot13(str_rot13($x)));
bool(true)

answered Jul 6, 2014 at 17:32

kojiro

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5 Comments

user3771854 Over a year ago

no you understand not correctly, I want same code but changed only domain names, can you help me?

kojiro Over a year ago

Get the decoded version, change the domain names, then do str_rot13 on the changed string.

Justin E Over a year ago

If you change any encoded text after decoding the text, you simply apply rot13 again. Then you can replace the existing rot13 text with your text, and it will update.

user3771854 Over a year ago

so how can I rot13 again?

kojiro Over a year ago

By use of the str_rot13 function you already know and love.

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